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Abstract
Broadcast encryption is a fairly new area in cryptology. It was first addressed in
1992, and the research in this area has been large ever since. In short, broadcast
encryption is used for efficient and secure broadcasting to an authorized group
of users. This group can change dynamically, and in some cases only one-way
communication between the sender and receivers is available. An example of this
is digital TV transmissions via satellite, in which only the paying customers can
decrypt and view the broadcast.
The purpose of this thesis is to develop a general Java framework for implementation and performance analysis of broadcast encryption algorithms. In addition to
the actual framework a few of the most common broadcast encryption algorithms
(Complete Subtree, Subset Difference, and the Logical Key Hierarchy scheme) have
been implemented in the system.
This master’s thesis project was defined by and carried out at the Information
Theory division at the Department of Electrical Engineering (ISY), Linköping
Institute of Technology, during the first half of 2004.